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Old 07-31-2011, 08:42 PM   #1
kyleyap
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Default testing o2 sensor

anyone here ever est there o2 sensor with a multimeter?. I was trying to see the voltage while it was running but it didnt seem to work right.
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Old 08-01-2011, 09:07 AM   #2
suberdave
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its real hard to check it with a multimeter. unless you have a real fast good one, such as a Fluke 78 or so.

what you realy need is an oscilloscope or graphing multimeter.

you have to back probe the signal wire, you should find the voltage should vary between .200 volts and .800 volts. it should wave between the two, about 3-5 times in 5 seconds, at 2500RPM.

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Old 08-01-2011, 11:59 AM   #3
kyleyap
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i was just using a cheap multimeter so that explains why it didnt work right
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Old 08-01-2011, 10:47 PM   #4
69subaru360
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Usually they seem to have 2 failure modes. It takes a dump completely and you get a cel or the car surges at cruise speeds and hesitates on light accel with no cel.
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Old 08-02-2011, 12:23 AM   #5
kyleyap
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i was thinking it may have a partial failure or something. It sometimes has a slight hesitation on wot pulls but nothing major. i was thinking it may be the o2 sensor because it keeps failing the local emissions test and i dont wanna just change a bunch of parts unless its necessary
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Old 08-02-2011, 01:22 AM   #6
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I could never get a stock 02 sensor to work correctly on my car (as shown by my narrowband AFR gauge). The only time it worked as expected was when I got a wideband (Innovate LC-1) and wired up the narrowband output to the car.
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Old 08-02-2011, 08:35 AM   #7
69subaru360
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Quote:
Originally Posted by kyleyap View Post
i was thinking it may have a partial failure or something. It sometimes has a slight hesitation on wot pulls but nothing major. i was thinking it may be the o2 sensor because it keeps failing the local emissions test and i dont wanna just change a bunch of parts unless its necessary
The O2 sensor does nothing at WOT.
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Old 08-02-2011, 09:20 AM   #8
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Quote:
Originally Posted by 69subaru360 View Post
The O2 sensor does nothing at WOT.
+1

also if you havent already check plug gap and coil packs for cracks.

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Old 08-02-2011, 09:57 AM   #9
TommyAtomic
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Quote:
Originally Posted by kyleyap
i was thinking it may have a partial failure or something. It sometimes has a slight hesitation on wot pulls but nothing major. i was thinking it may be the o2 sensor because it keeps failing the local emissions test and i dont wanna just change a bunch of parts unless its necessary
I seem to remember something about you already doing the coil pack upgrade. Did you replace the plugs when you upgraded coils? What plugs did you install and what did you gap them?
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Old 08-02-2011, 10:14 AM   #10
kyleyap
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I havent done plugs yet. I have ngk iridiums gapped at .028 waiting to go in
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Old 08-02-2011, 08:36 PM   #11
jonny_88
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I'm having problems with misfiring at constant speeds, and I also have a misfire code on each cylinder. Could a bad o2 sensor be causing this problem?

Also, pmugabi, is it normal to wire up the LC-1 to the ecu on narrowband? I might just do this if that's the case. I checked on a new sensor at o'rielly's and they wanted $240.

Last edited by jonny_88; 08-03-2011 at 12:18 AM.
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Old 08-03-2011, 03:03 AM   #12
pmugabi
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Misfire could be any of plugs, coils, MAF, 02 sensor.

Yes it's easy to wire up an LC-1 as a narrowband sensor, the LC-1 manual describes how to do it. What I did in my case was to hack off the connector at the end of the 02 sensor and use that to connect to the LC-1 loom, that way you can go back to another stock 02 sensor any time you like. Plus replacement wideband sensors are only about $50-60.
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